The recent breakthrough in natural gas exploration at the well Pingqiao 1 in the eastern Sichuan basin highlights the significant exploration potential of the Xixiangchi Formation. However, the sequence stratigraphy and paleogeographic distribution of the Xixiangchi Formation in this region remain subjects of ongoing debate, hindering further exploration efforts. To address these unresolved issues, this study undertook a comprehensive investigation of the Xixiangchi Formation, integrating data from seismic surveys, drilling operations, core samples, thin sections, well logs, and geochemical analyses (including carbon, oxygen, and U isotopes). The study further incorporated INPEFA logging rotary, wavelet transform, and astronomical orbital cycle analysis to systematicallyexamine the stratigraphy, reconstruct the paleogeography, and establish a sedimentary model. Our results reveal: (1) The Xixiangchi Formation in the study area can be subdivided into 5 third- order sequences (SQ1- SQ5) and 13 fourth- order sequences (SSQ1- SSQ13); (2) During the depositional period of the Xixiangchi Formation, the study area exhibited a general westward high and eastward low paleogeographic pattern, conducive to the development of a restricted platform. The study area mainly featuresthree sedimentary subfacies: tidal flat, granular beach, and lagoon, including ninedistinct sedimentary microfacies.